A 2004 Mercedes-Benz E500 requires 8.5 quarts of oil. According to page 400 of the User's Manual a 2004 E500 requires 8 US quarts of oil. The E320 requires 8.5 quarts and the E55 requires 9 quarts.
5 quarts
8 quarts...
8.44 quarts
The 2004 Mercedes-Benz C-Class has 16 valves.
The 2004 Mercedes-Benz G-Class has 24 valves.
The 2004 Mercedes-Benz E-Class has 18 valves.
The 2004 Mercedes-Benz CL-Class has 24 valves.
The 2004 Mercedes-Benz S-Class has 24 valves.
The 2004 Mercedes-Benz SLK-Class has 16 valves.
The 2004 Mercedes-Benz M-Class has 18 valves.
The 2004 Mercedes-Benz SL-Class has 24 valves.